Circuit arrangement for limiting the current at make for a trans

Details Circuit arrangement for limiting the current at make for a trans Circuit arrangement for limiting the current at make for a trans

1998-12-02

2000-07-25

Philogene, Haissa

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315279, 315224, 361 57, 361112, 361102, H05B 4116

Patent

active

060940131

ABSTRACT:
A circuit arrangement for limiting the current at make for a transformer wherein, in order to avoid the current peak at make when switching a transformer on, resistors are connected between operating voltage and the primary winding of the transformer. A test winding at the secondary side of the transformer is connected via a rectifier to the supply input of a contactor, so that the switches of the contactor close after the transformer is turned on and the resistors therefore no longer lie between operating voltage of the primary winding. PTC-resistors connected in series with the resistors assure that the resistors are not overloaded by the high-operating current of the transformer if the switches do not switch.

REFERENCES:
patent: 3809985 (1974-05-01), Krause et al.
patent: 4414601 (1983-11-01), Conroy, Jr.
patent: 5530613 (1996-06-01), Bauer et al.

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